{"product_id":"milltek-non-resonated-secondary-cat-bypass-for-bmw-g8x-m3-m4-ssxbm1270-ssxbm1270","title":"Milltek Non-Resonated Secondary Cat Bypass for BMW G8X M3 M4 (SSXBM1270)","description":"\u003cp\u003eThe Milltek Axle Back Non-Resonated Secondary Cat Bypass is engineered for BMW G8X M3 and M4 models (S58 engine). This performance component replaces the factory secondary catalyst, delivering improved exhaust flow and a sharper acoustic character. Direct fitment to OE downpipes and OE axle-back systems—no modification required.\u003c\/p\u003e\n\u003cp\u003eHand-finished T304L stainless steel construction with mandrel-bent 76.20mm (3.00\") primary bore. Non-resonated design eliminates the OE resonance chamber for full-throttle note clarity. CNC-formed flanges ensure precise factory alignment and OEM hanger compatibility.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFitment: BMW G8X M3 (G80) and M4 (G82\/G83) with S58 engine\u003c\/li\u003e\n\u003cli\u003eMaterial: T304L stainless steel, hand-finished\u003c\/li\u003e\n\u003cli\u003eBore: 76.20mm mandrel-bent primary\u003c\/li\u003e\n\u003cli\u003eConfiguration: Non-resonated secondary cat bypass\u003c\/li\u003e\n\u003cli\u003eInstall: Direct replacement—uses factory mounting points and OEM hangers\u003c\/li\u003e\n\u003cli\u003eSound character: Aggressive full-throttle note, reduced mid-range resonance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e Engineered for serious track and closed-course driving. \u003c\/p\u003e\n\u003cp\u003eFits OE system.\u003c\/p\u003e\n\u003cp\u003eDesigned and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.\u003c\/p\u003e\n\u003ch3\u003eVehicle fitment\u003c\/h3\u003e\n\u003cul class=\"fitment-list\"\u003e\n\u003cli\u003e2021-2026 BMW M3 Competition\u003c\/li\u003e\n\u003cli\u003e2021-2026 BMW M4 Competition\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":60150746611998,"sku":"MILSSXBM1270","price":1155.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXBM1270_1.jpg?v=1791255330","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-non-resonated-secondary-cat-bypass-for-bmw-g8x-m3-m4-ssxbm1270-ssxbm1270","provider":"Signature Autohaus","version":"1.0","type":"link"}